No. 188, 
DECEMBER 1813. 
Mea 2 
Tf 
Published the Last Day of every Month, 
[PRICE 2s. 6d.] 
Lee re nn ee mma mre 
THE 
\PHILOSOPHICAL MAGAZINE: 
COMPREHENDING 
THE VARIOUS BRANCHES OF SCIENCE, 
THE LIBERAL AND FINE ARTS, 
GEOLOGY, ° 
a -- AGRICULTURE, 
IN MANUFACTURES AND’COMMERCE. 
ig 
ie NUMBER CLXXXVIII. 
2 Fir DECEMBER 1818. 
ye 
. CONTAINING THE FOLLOWING ENGRAVING: 
eS 
A A 
Buoy * { 2B 
say A. Plate to illustrate Mr. T. Jones’s Sectograph,—-a new Instru- S89 
icig ment for dividing right Lines into equal Parts, measuring 
ie Angles, and inscribing Polygons in the Circle, &c. 
% 
“Bre aaa 
M06) CU (BY ALEXANDER TILLOCH, 
2 | aie M.R.I.A. F.S.A. EDIN. AND PERTH, Xc. 
eae LONDON: 
~@ “PRINTED BY RICHARD AND ARTHUR TAYLOR, SHOE LANE! 
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